Device for promoting the combustion of carbon-monoxide gas



Dec. 18 1923. 1,478,11fl6 J. w. CRAIG DEVICE FOR PROMOTING THE COMBUSTION OF CARBON MONOXIDE GAS Filed July 25 1921 m gllglpzal,

IN V EN TOR.

J' W6 BY @77263 I rail-9 A TTORNEYS.

Patented et. 1%, i923.

JAMES W. CRAIG, OE PROVIDENCE, RHODE ISLANB, ASSIGNOR TO CARBON MONOXIDE BURNER COMPANY, OF. PROVIDENCE, RHODE ISLAND, A CORPORATION OF BHODE ISLAND.

DEVICE non PROMOTING re n commission or CARBQN-MONOXIDE: Gas.

Application filed July 25, 1921-.

To all whom it may concern:

Be it known that 11, JAMES W, CRAIG, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Devices for Promoting the Combustion of Carbon-Monoxide Gas, of which the following is a specification.

This inyention relates to new and useful improvements in the construction of combustion promoting devices for furnaces; and the object of this; invention is to provide an improved heating chamber having in it a plurality of air-heating tubes through which atmospheric air is caused to pass, and a further object of the invention is to divide these tubes into. sets and to cause the air to take a zigzag course in passing alternately through saic sets before. passing into the firebox.

\Vith these and other objects in view, the invention consists of certain novel features of construction, as will be more fully de scribed, and particularly pointed out in. the appended claims.

In the accompanying drawings.

Figure 1 is a plan View showing the general shape and arrangement of my improved heating chambers as attached to the stoking door of a furnace to swing therewith.

Figure 2 is a view of the inner end of the heating chamber, showing the ends of the tubes through which the heated gases are conducted into the firebox of a furnace.

Figure 3 is. a sectional side elevation showing the arrangement of the heating tubes in the inner heating chamber.

Figure 4 is a section on line l-4 of Figure 3, through the chamber and the heating tubes.

Figure 5 .is a front end view of the outer chamber showing the movable valve member for controlling the air inlet openings.

Figure 6 is a front view of the perforated baffle plate for breaking up the air passing therethi'ough.

Figure T-is an edge view of this plate.

Figure 8 is a modification showing the spacer chamber as set on an angle to permit the longer heating chamber to be supported won the inner surface ofthe stolzing; door to Serial No. 487,370.

swing therewith through the stoking opening.

As is well known a cool draft of air introduced through the slide in the ordinary furnace door tends to chill the gas below the point of ignition so that instead of being consumed a large portion of the carbon monoxide gas thrown off from the fuel escapes up the chimney losing a large portion of the heat units which should have been utilized.

By the use of my present invention I heat the incoming air to such, a degree that it readily mixes with and renders combustible these carbon monoxide gases which are by this method consumed, greatly increasing the heating eihciency of the furnace; and the following is a detailed description of one means by which this result may be accomplished lVith reference to the drawings, 10 designates the furnace dOOr which is mounted on hinges 11 to the body of the furnace, a portion of which is shown in section at 12. This door is providedwith a central opening 13 through it and on its outer face is supported acasing 14 which may be connected to this door in any suitable way, but I preferably form this outer casing integral with the door as shown in Figure 3.

The front wall 15 of this casing is shown as being provided with a pair of smal openings 16 and a pair of large openings 17 both pairs being controlled by a single valve plate 18' which is centrally pivoted on. the pin 19 so that it may be swung to either partly or wholly close either of said sets of openings whereby the amount of inflowing air through these openings may be nicely controlled.

Spaced inwardly from the outer wall 15 of this chamber. is a batiie plate 20 which is held in position on the imier end of the pivot pin 19 being spaced from said. front plate by the lugs or legs 21.

This plate is perforated or provided with a plurality of holes as at 22 for breal cing up the volume of air as it passes there-- through To the inner surface of this door 101 have secured an intermediate or spacing chamber 23 and to the outer surface of. this chamber I have mounted an inner chamber 24. This inner chamber is shown as being provided with outwardlyturned flanges which are bolted in position to the intermediate chamber by means of bolts 26 which serve to secure both chambers to the furnace door 10.

This inner chamber is provided with a removable wall 27 located near its outer end and is bound in position by contacting with the inturned edge 28 of the intermediate chamber and this wall 27 is provided with a set of tubes 29 formed thereon which are horizontally disposed and extend into the inner chamber nearly the length thereof. The outer end 30 of this set of tubes is opened into the intermediate chamber 23 through this wall while their inner ends 31 open near the rear wall 32 of said chamber causing the air to take a zigzag course in passing through this chamber.

This rear chamber wall 32 is also provided with a set of horizontally disposed tubes 33 extending from the rear face forwardly into the chamber, the outer ends 3% of these tubes are open near the outer wall 27 of the chamber to receive the air from the first set of tubes and the outer ends of these tubes 33 are open as at 35 through the rear plate 32 to permit the passage of the heated air through the chamber out into the firebox of the furnace.

1 By this construction it will be seen that the heated air first enters the holes through 7 the front plate of the casing and is broken up by passing through the openings 22 in the baffle plate 20. From here it is passed through the intermediate chamber 23 supported on the inside of the stoking door, thence it passes inwardlythrough' the set of tubes 29 and upon issuing from their inner ends con tacts with the hightly heated end wall 32 of the chamber, whereby it is directed backward through the chamber to enter the outer ends 341: of the discharge set of tubes 33 and after traveling through these tubes which are also hightly heated, is finally discharged into the firebox of the furnace rendering com bustile the carbon monoxide gases which are being thrown off from the fuel. g

In order to facilitate the heating of this inner chamber I have provided a plurality of concentric spaced apart ribs 36 about the outer surface of the same which serve to facilitate the heating of the air therein.

It is often found in practice desirable to provide a spacing member between the inner face of the stoking door and the intake air-heating chamber for the reason that the thickness ofthe wall at the fire door varies widely in different heaters. Then again it is found desirable to position the heating chamber in the fire chamber as far as possible in order to produce the best results and in order to do thisin a simple and eflective way I have provided an intermediate or spacing chamber or casing 23 which may be made in varying widths and which may be readily interposed between the heating chamber and the door so as to extend the heating chamber to just the right position in the firebox.

Then again in some instances I form the inner surface of the wall of this spacing chamber on an angle as at 37 in Figure 8, whereby the axis of the heating chamber is set on an angle to permit a longer or more extended chamber to be employed and still be able to swing it with the door outthrough the stoking opening. I

My improved device is extremely simple and practical in construction and effective in its operation and by its use the efiiciency of heating the gases over the old style heaters, is increased.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being definedand' limited only by the terms of the appended claims;

I claim: 7

1. In a combustion promoting device for furnaces, a stoking door, a casing carried on the inner side of said door having a plurality of sets of tubular air heating members, the free ends of said members being arranged in overlapping or staggering relation whereby the entering air is caused to take a zigzag course and pass alternately through said sets of tubes before being admit-tedinto the fire V chamber.

2. In a combustion promoting device for furnaces, a stoking door, acasing carried on the inner side of said door having a plurality of sets of longitudinally disposed tubes, the tubes of said sets being supported by their ends to extend in opposite directions with said ends overlapping and near opposite ends of the chamber whereby the entering nately through said sets of tubes before escaping into the fire chamber.

3. In a combustion promoting device for furnaces, a stoking door, a casing carried on the inner side of said door having a plurality no air is caused to pass in a zigzag course alterof sets of longitudinally disposed tubes, said 7 sets being supported to extend inwardly in opposite directions from the opposite end walls of the casing, one of said walls being removable and both having openings through them communicating with the tubes supported therein whereby the entering air 7 is caused to pass in a zigzag course alternately through said sets of tubes before e scaping into the firebox. 7

l. In a combustion promoting device for furnaces, an outer casing supported on the stolring door and covering an openingtherethrough, said casing being provided with four inlet openings arranged quandrangularly, two of said openings which are diagonally arranged being larger than the other tWo, a valve member pivoted intermediate its ends to said casing centrally between said openings, the ends of said member being of sufficient length and breadth to cover said two larger openings and to control the pars sage of air through all of said openings ac cording to its position, and an inner chamber supported on said door having means therein for conducting the incoming air to pass back and forth therethrough. before being permitted to pass out into the firebox.

In testimony whereof I afiiX my signature.

JAMES W. CRAIG. 

